It looks at 277 metro areas in the U.S. Houston ranks seventh highest on the list when it comes to ozone. But it's 112th when it comes to 24-hour particle pollution.
Dallas-Fort Worth ranks eighth when it comes to ozone. The Beaumont-Port Arthur area ranks 20th.
As far as the most polluted city, that's Los Angeles. The cleanest is Ames, Iowa.
Click here to see the entire list and report.
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